| 乙丙共聚物的13C NMR研究 |
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| 引用本文： | 李三喜,马瑞春.乙丙共聚物的13C NMR研究[J].波谱学杂志,1998,15(2):109-116. |
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| 作者姓名： | 李三喜 马瑞春 |
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| 作者单位： | 1.沈阳化工学院高分子系, 沈阳 110021;2.锦州市金城造纸 (集团)有限责任公司职工子弟中学, 锦州 121203 |
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| 基金项目： | 国家教委留学回国人员科研经费资助,日本国文部省国际科研合作计划支持项目 |
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| 摘 要： | 研究用化学反应法制备的镁钛系载体高效催化剂合成的乙丙共聚物的13C NMR谱图,提出了无需进行分峰处理,通过将谱图直接分为八个独立的区域,并选取其中受仪器测试条件等影响较小的五个谱区的强度,直接计算此类共聚物序列分布的方法,并分别采用伯努利模型和马尔科夫模型对共聚物的三单元组序列分布进行处理,指出在化学反应法制备的载体催化剂催化的乙丙共聚合扫次末端基效应机理进行,且催化剂活性中心有利于乙丙各自的均聚合.
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| 关 键 词： | 乙丙共聚物 13C NMR 序列分布 伯努利模型 马尔科夫模型 |
| 收稿时间： | 1997-07-22 |
13 C NMR STUDIES OF ETHYLENE PROPYLENE COPOLYMERS SYNTHESIZED WITH SUPPORTED ZIEGLER NATTA CATALYST MADE BY CHEMICAL REACTION METHOD |
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| Li Sanxi,Ma Ruichun and Zhang Fan.13 C NMR STUDIES OF ETHYLENE PROPYLENE COPOLYMERS SYNTHESIZED WITH SUPPORTED ZIEGLER NATTA CATALYST MADE BY CHEMICAL REACTION METHOD[J].Chinese Journal of Magnetic Resonance,1998,15(2):109-116. |
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| Authors: | Li Sanxi Ma Ruichun and Zhang Fan |
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| Institution: | 1.Department of Polymer Science, Shenyang Institute of Chemical Technology, Shenyang 110021;2.Jinzhou Jincheng Papermaking Group, Ltd. Jinzhou 121203 |
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| Abstract: | A new characterization method for determining the sequence distribution of ethylene propylene copolymers, obtained with a supported Ziegler Natta catalyst made by chemical reaction method, was carried out by 13 C NMR spectroscopy. By dividing the 13 C NMR spectrum into eight individual regions, triad sequence distribution and composition of EP copolymer were calculated through using five integrals of these regions to avoid the use of the other three condition sensitive regions. Comparison of experimental versus calculated triad distribution points out that the first order Markovian model was more fit to the copolymer sequence distribution and the catalytic active sites are more favorable to ethylene and propylene homopolymerization. |
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| Keywords: | Ethylene propylene copolymer 13 C NMR spectroscopy Sequence distribution Bernoullian model Markovian model |
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